ATI 5770 Dual Display / HDMI setup

[Nordlead]

Has anyone managed to use the DisplayPort or HDMI port (for a display, don't care about sound right now) on a 5770 under 10.6.5, in particular on a model that does not have two DVI ports (e.g. Gigabyte SilentCell, MSI Hawk) for a dual display?

 

I found quite a lot of posts where this does not work, so it would be great to learn otherwise, in particular what framebuffers you use (and what else might do the trick).

 

I've struggled for 24 hours now and only get the DVI port of my 5770 Silent Cell (GV-R577SL-1GD) to work - HDMI is dead. For clarification: the card runs nicely in 64-bit, but there is no reaction when adding a second display via HDMI.

 

I use Kairy's boot loader, DSDT.aml, a rom-file for the card. As it looks that "normal" cards following the reference design (2 DVI ports) can actually use the HDMI port (in some cases), my guess is that the problems on boards with only one DVI-port are related to that fact(?)

 

Thanks for sharing your experience(s)!!!

[slann303]

I have the Gigabyte Silent Cell with the Nvidia 9800GT. Of course, it is a totally different card, but I and lots of other people have the same problem like you. However, dual screen output works in 10.6.0 and 10.6.1 without problems, that means DVI and HDMI in use simultaneously. Did you install SL from a 10.6.3 retail disk? You could try to install it with an old 10.6.0 retail disk and see if it works. If dualscreen capability is important to you, you could stick with 10.6.1 (or make a rollback when using 10.6.2 to the previous kext, at least for NVidia cards this method works).

 

 

 

If there is a VGA port additional to DVI and HDMI on your card, you could try to hook up one monitor with VGA and the other (TV probably) via DVI (and using an HDMI adapter). In some instances, at least for me, this setup worked, even in 10.6.8. Unfortunatelely, at least in my case, it was not satisfying, because resolutions that were given using VGA were rather low.